Terminology
This page gives definitions for some of the technical terms found on the INSIGHT website.
Term Definition
Base Flow Index Proportion of streamflow that exists as base flow (calculated using a base flow separation technique).
Comingled Irrigated Acres Amount of estimated acreage identified as having the potential to be irrigated by both groundwater and surface water.
Diversion The amount of water, measured at a point, that has been turned aside or altered from the natural course of a flow of water and diverted for a beneficial use.
Downstream Demand The Basin Water Supply necessary to exit a basin or sub-basin to meet the proportionate amount of non-tributary demands or basins or sub-basins located downstream.
Dryland Acres Cropped acreage that is not irrigated.
Groundwater Consumption Groundwater consumptive use estimated for either irrigation, municipal, or industrial uses that are located in the hydrologically connected area.
Groundwater Depletion The modeled impacts of groundwater pumping on stream base flows.
Groundwater Irrigated Acres Amount of acreage estimated to be irrigated by groundwater.
Hydropower Demand Demands for streamflows appropriated for hydropower purposes.
Instream Flow Demand Demands for streamflow taking place within the stream channel to provide beneficial use for fish, recreation, and wildlife. These demands are based on current appropriations held by the Nebraska Game and Parks Commission or any local Natural Resources Districts. Due to the non-consumptive nature of these demands it is possible that other non-consumptive demands (i.e. hydropower) may serve to represent a portion of the demand.
Long Term Balance Difference between Total Long Term Demand and Total Basin Water Supply
Near Term Balance The difference between Total Near Term Demand and Total Basin Water Supply.
Net Surface Water Loss Net streamflow necessary to convey surface water consumptive uses. The water represents the water that may be lost in delivering water from a Diversion point to a field. An example would be the delivery of water through an unlined canal to a field.
Non-Tributary Demands The surface water demands capable of making physical use of water supplies that exit a basin or sub-basin located upstream. Additionally, this includes groundwater consumption that is capable of utilizing those same surface water sources. Groundwater uses are determined as those within the hydrologically connected area.
Other Acres All other non-cropped acres.
Precipitation Rate Estimated annual rate of precipitation occurring within a given sub-basin (i.e., precipitation volume divided by land area of given basin or sub-basin).
Precipitation Volume Estimated annual volume of precipitation occurring within a given basin or sub-basin.
Projected Long Term Balance Difference between Total Projected Long Term Demand and Total Basin Water Supply.
Required Inflow Determined by summing the proportionate downstream demands that were assigned to each basin or sub-basin located upstream. While the term "required inflow" is used, this does not represent inflows that are required by permit or statute; it is simply a term coined for these methods and it is necessary as a means to provide more spatially refined (i.e., for sub-basin) evaluations.
Reservoir Evaporation Volume of water evaporation from large reservoir sources.
Streamflow The discharge of water in a natural channel and measured at a gaging location at the outlet of a basin or sub-basin. These flows have been truncated at the 5% exceedence flow probability level to remove extreme events.
Streamflow Gain The discharge of water in a natural channel and measured at a gaging location at the outlet of a basin or sub-basin less the amount of streamflow measured at the basin or sub-basin immediately upstream. These flows have been truncated at the 5% exceedence flow probability level to remove extreme events.
Surface Water Consumption Surface water consumptive use estimated for either irrigation, municipal, or industrial uses.
Surface Water Demand Surface water demand for irrigation, municipal, or industrial uses (recognizes potential limitations due to administration for senior water uses)
Surface Water Irrigated Acres Amount of acreage estimated to be irrigated by surface water.
Total Basin Water Supply The streamflow water supply available absent major activities of man. This value is calculated by recreating the streamflow that would have been available with no Diversion or Groundwater Depletion.
Total Evapotranspiration Evapotranspiration of all land uses of the basin or subbasin water supply. Calculated as the Precipitation Volume less Streamflow.
Total Groundwater Consumption The combined groundwater consumptive use estimated for irrigation, municipal, and industrial uses located in the hydrologically connected area.
Total Irrigated Acres Summation of all acres irrigated through groundwater, surface water, or comingled.
Total Long Term Demand The total demand for consumptive and non-consumptive uses of streamflow by surface water and groundwater uses. These demands include: Groundwater Consumption, Surface Water Demand, Hydropower Power Demand, Instream Flow Demand, Net Surface Water Loss, and Downstream Demands.
Total Near Term Demand The total demand for consumptive and non-consumptive uses of streamflow by surface water and groundwater uses. These demands include: Groundwater Depletion, Surface Water Demand, Hydropower Power Demand, Instream Flow Demand, Net Surface Water Loss, and Downstream Demands.
Total Projected Long Term Demand The total demand for consumptive and non-consumptive uses of streamflow by surface water and groundwater uses. These demands are represented by adding 5% of additional demand to the Total Long Term Demand.
Total Recharge Estimated recharge that is based on evaluation of the base flow (groundwater discharge to streams) portion of basin or sub-basin streamflow.
Total Runoff Estimated overland runoff that is based on the remaining portion of the basin or sub-basin streamflow supply not represented as recharge.